Study on preparation of spherical Al<sub>2</sub>O<sub>3</sub> by nucleation-coating method and its application in propane dehydrogenation

CHEN Zhi; WU Fan; GAO Xinqian; HE Lei; LU Anhui

doi:10.12434/j.issn.2097-2547.20230207

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Study on preparation of spherical Al₂O₃ by nucleation-coating method and its application in propane dehydrogenation

- Study on preparation of spherical Al₂O₃ by nucleation-coating method and its application in propane dehydrogenation
- Vol. 49, Issue 2, Pages: 49-59(2024)
- 作者机构：
  
  大连理工大学化工学院精细化工国家重点实验室，辽宁省低碳资源高值化利用国家重点实验室，辽宁大连 116024
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20230207
  CLC： TQ426
- Published：25 February 2024，
  
  Received：10 June 2023，
  
  Revised：04 August 2023，
- 稿件说明：
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陈执,吴凡,高新芊等.造核-包衣法制备Al₂O₃小球及其在丙烷直接脱氢反应中的应用研究[J].低碳化学与化工,2024,49(02):49-59.

CHEN Zhi,WU Fan,GAO Xinqian,et al.Study on preparation of spherical Al₂O₃ by nucleation-coating method and its application in propane dehydrogenation[J].Low-carbon Chemistry and Chemical Engineering,2024,49(02):49-59.
陈执,吴凡,高新芊等.造核-包衣法制备Al₂O₃小球及其在丙烷直接脱氢反应中的应用研究[J].低碳化学与化工,2024,49(02):49-59. DOI： 10.12434/j.issn.2097-2547.20230207.

CHEN Zhi,WU Fan,GAO Xinqian,et al.Study on preparation of spherical Al₂O₃ by nucleation-coating method and its application in propane dehydrogenation[J].Low-carbon Chemistry and Chemical Engineering,2024,49(02):49-59. DOI： 10.12434/j.issn.2097-2547.20230207.

摘要

氧化铝（Al

）载体是应用最广泛的催化剂的核心材料之一，而球形Al

载体取代条形Al

载体已成为大趋势，因此亟需发展绿色可行的制备球形Al

载体新方法。首先对滚球法进行了优化，以拟薄水铝石粉体为原料，硝酸为胶溶剂，羟丙基甲基纤维素为粘结剂，采用造核-包衣法制备了球形度好、强度高且比表面积大的Al

小球。结合X射线衍射（XRD）、扫描电子显微镜（SEM）等表征手段考察了水粉比（质量比）、酸粉比（质量比）、粘结剂含量（质量分数）和抛丸时间对Al

小球的强度和孔结构的影响。结果表明，控制酸粉比为0.050、水粉比为0.88、粘结剂含量为3%（质量分数）和每次抛丸时间为5 min，能够制备出粒径均匀、成品率高且强度高达43.0 N的Al

小球。在此基础上，制备了球形和粉末PtSn/Al

催化剂，并在温度为618 ℃、H

和C

流量分别为3.6 mL/min和6.0 mL/min的条件下应用于丙烷直接脱氢反应，发现球形PtSn/Al

催化剂表现出与粉末PtSn/Al

催化剂接近的反应活性和选择性。造核-包衣法是一种绿色高效的制备球形Al

载体的方法，可为球形Al

载体国产化提供新的思路。

Abstract

Aluminum oxide (Al

) support is one of the most widely used catalytic materials

and replacing linear Al

support with spherical Al

support has become a major trend

so it is urgent to develop novel green and feasible methods for producing spherical Al

support. Firstly

spherical Al

with excellent sphericity

high strength and large specific surface area was prepared by nucleation-coating method: using pseudo boehmite as the raw material

nitric acid as the peptiser and hydroxypropyl methyl cellulose as the binder to optimize the rolling ball method. The effects of water-powder ratio (mass ratio)

acid-powder ratio (mass ratio)

binder content (mass fraction) and blasting time on the strength and pore structure of spherical Al

were investigated by characterization methods such as X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that spherical Al

with uniform particle size

high yield and high average compressive strength of 43.0 N can be prepared by controlling the acid-powder ratio of 0.050

water-powder ratio of 0.88

binder content of 3% (mass fraction) and blasting time of 5 min. Furthermore

spherical and powder PtSn/Al

catalysts were prepared and applied to propane dehydrogenation at 618 ℃

and C

flow rate of 3.6 mL/min and 6.0 mL/min

respectively. The spherical PtSn/Al

catalyst shows similar activity and selectivity as the powder PtSn/Al

catalyst. Nucleation-coating method is green an

d efficient to prepare spherical Al

support

which provides inspirations for localization of spherical Al

support.

关键词

Al2O3小球造核-包衣法Al2O3成型强度丙烷直接脱氢

Keywords

spherical Al2O3nucleation-coating methodAl2O3 moldingstrengthpropane dehydrogenation

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Study on preparation of spherical Al2O3 by nucleation-coating method and its application in propane dehydrogenation

DOI：10.12434/j.issn.2097-2547.20230207

摘要

Abstract

关键词

Keywords

references

Study on preparation of spherical Al₂O₃ by nucleation-coating method and its application in propane dehydrogenation